Which of the following reactions is an example of a disproportionation reaction?

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Question: Which of the following reactions is an example of a disproportionation reaction? (2023)

Options:

Correct Answer: 2H2O2 → 2H2O + O2

Exam Year: 2023

Solution:

In the reaction 2H2O2 → 2H2O + O2, the oxidation state of oxygen changes from -1 in H2O2 to 0 in O2, indicating that it is both oxidized and reduced.

Which of the following reactions is an example of a disproportionation reaction? (2023)

Which of the following reactions is an example of a disproportionation reaction? (2023)

Step 1: Understand what a disproportionation reaction is. It is a type of reaction where a single substance is both oxidized and reduced.
Step 2: Look at the given reaction: 2H2O2 → 2H2O + O2.
Step 3: Identify the oxidation states of oxygen in the reactants and products.
Step 4: In H2O2 (hydrogen peroxide), the oxidation state of oxygen is -1.
Step 5: In H2O (water), the oxidation state of oxygen is -2.
Step 6: In O2 (oxygen gas), the oxidation state of oxygen is 0.
Step 7: Notice that in this reaction, oxygen changes from -1 in H2O2 to 0 in O2 (oxidation) and from -1 to -2 in H2O (reduction).
Step 8: Conclude that since the same element (oxygen) is both oxidized and reduced, this reaction is a disproportionation reaction.

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